User blog comment:Parinwaris/A Noob(Clearly)Needs Help - Part 2!!/@comment-33568874-20171225151121

The moveset should have special moves. Sceptile (and mega sceptile) both have higher Sp. Attack than Attack. In that case you should have this moveset:

Sceptile (Male)

Nature: (whatever yours is)  Item: Sceptilite C

252 Special Attack, 252 Speed, 4 HP

Leaf Storm

Focus Blast

Ice Beam

Hidden Power Fire / Energy Ball

You can find Hidden Power in Frostveil City, or Energy Ball in the Battle Colluseum Marketplace. Leaf storm is very strong, but as it halves your attack (-2 stages in Sp. Attack), you can lose momentum quickly. I suggest switching out after Leaf Storm, as you can reset the negative stat changes.

The 252 in speed changes everything. Leaf Storm & Energy Ball are your OHKO moves, so you want to be able to outspeed as much as possible.